centos下如何使用sendmail发送邮件

一、安装sendmail

1、打开终端，输入：yum install sendmail

2、安装完成后，输入service sendmail start，启动sendmail服务

二、配置sendmail

1、编辑sendmail配置文件

vi /etc/mail/sendmail.mc

2、在文件末尾加入

define(`SMART_HOST',`smtp.***.com')dnl

define(`RELAY_MAILER_ARGS', `TCP $h 25')dnl

define(`ESMTP_MAILER_ARGS', `TCP $h 25')dnl

define(`confAUTH_OPTIONS', `A p')dnl

TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl

define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl

define(`confCACERT_PATH',`/etc/pki/tls/certs')dnl

define(`confCACERT',`/etc/pki/tls/certs/ca-bundle.crt')dnl

define(`confSERVER_CERT',`/etc/pki/tls/certs/sendmail.pem')dnl

define(`confSERVER_KEY',`/etc/pki/tls/certs/sendmail.pem')dnl

dnl #

dnl # “Smart” relay host (may be null)

dnl #

define(`SMART_HOST',`smtp.***.com')dnl

dnl define(`RELAY_MAILER_ARGS', `TCP $h 25')dnl

dnl define(`ESMTP_MAILER_ARGS', `TCP $h 25')dnl

dnl #

dnl # 下面三行是授权设置

dnl #

define(`confAUTH_OPTIONS', `A p')dnl

TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl

define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl

dnl #

dnl # 安全连接所需的证书

dnl #

define(`confCACERT_PATH',`/etc/pki/tls/certs')dnl

define(`confCACERT',`/etc/pki/tls/certs/ca-bundle.crt')dnl

define(`confSERVER_CERT',`/etc/pki/tls/certs/sendmail.pem')dnl

define(`confSERVER_KEY',`/etc/pki/tls/certs/sendmail.pem')dnl

3、输入make -C /etc/mail，重新生成sendmail.cf文件

4、重新启动sendmail服务

service sendmail restart

三、发送邮件

1、使用telnet命令发送邮件

telnet smtp.***.com 25

2、输入以下命令，进行邮件发送

ehlo localhost

auth login

输入base64加密后的用户名和密码

mail from:发件人的邮箱地址

rcpt to:收件人的邮箱地址

data

标题：***

内容：***

quit

3、使用mail命令发送邮件

mail -s ”标题” 收件人的邮箱地址 < 邮件正文